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Segment Information - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Operating properties $ 3,832,348 $ 3,586,295 $ 3,693,000
Assets held for sale - real estate investments [1] 0 73,591 [2] 794,588
Operating Properties 3,832,348 3,659,886 4,487,588
Construction-in-progress 121,188 297,462 268,983
Land held for development [3] 98,242 150,970 130,479
Philadelphia CBD [Member]      
Segment Reporting Information [Line Items]      
Operating properties 1,643,296 1,320,974 1,157,667
Pennsylvania Suburbs [Member]      
Segment Reporting Information [Line Items]      
Operating properties 958,796 1,005,446 1,019,280
Metropolitan DC [Member]      
Segment Reporting Information [Line Items]      
Operating properties 978,257 975,987 1,129,206
Austin, Texas [Member]      
Segment Reporting Information [Line Items]      
Operating properties 163,653 146,794 164,518
Other [Member]      
Segment Reporting Information [Line Items]      
Operating properties [4] $ 88,346 $ 137,094 $ 222,329
[1] As of December 31, 2015, the Och-Ziff Portfolio and Cira Square were held for sale. As of December 31, 2016, the Concord Airport Plaza located in the Other segment and the Calverton portfolio located in the Metropolitan Washington, D.C. segment was held for sale. See Note 3, “Real Estate Investments,” for further information.
[2] Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation, land held for development or other assets on the balance sheets of the properties held for sale. See 2016 Held for Sale section below.
[3] As of December 31, 2017, the Company categorized 13.1 acres of land held for development located in the Other segment as held for sale in accordance with applicable accounting standards for long lived assets. See Note 3, “Real Estate Investments,” for further information.
[4] As a result of the Och-Ziff Sale that occurred on February 4, 2016, the Company narrowed its segments to five segments: (1) Philadelphia Central Business District (“CBD”), (2) Pennsylvania Suburbs, (3) Metropolitan Washington, D.C. and (4) Austin, Texas and (5) Other. The Och-Ziff Sale disposed of the entire Richmond, Virginia segment. See Note 3, “Real Estate Investments,” for further information.